a season-ending peroneal tendon rupture injury, in a EuroLeague game against Žalgiris Kaunas. It was the same right foot injury, that he had suffered in the previous 2018–19 season. On 7 February 2020, Spanoulis had another surgery to repair the tendon. On 12 May 2020, Spanoulis was named to the EuroLeague 2010–20 All-Decade Team. Among the 10 players voted onto the All-Decade Team, Spanoulis was voted the number one EuroLeague player of the 2010–2020 decade, in a vote decided by EuroLeague head coaches, EuroLeague players, fans, and sports journalists. He received more than twice as many votes as the player who came in second place in the voting, which was Bogdan Bogdanović. 2020–21 season On July 11, 2020, Spanoulis re-signed with Olympiacos, to a one-year €600,000 net income contract, through the 2020–21 season. On 10 December 2020, in a game against Red Star Belgrade, Spanoulis passed Juan Carlos Navarro, to become the all-time leading scorer in the history of Europe's top-tier level basketball competition, including all the history of the competition, under both the management of both FIBA and EuroLeague Basketball, dating back to the original FIBA European Champions Cup competition, in 1958. Spanoulis announced his intention to retire from playing professional club basketball on 26 June 2021. On 27 September 2021, he held a press conference, in which he officially announced his retirement from the sport. National team career Greek junior national team Spanoulis was a key member of the Greek under-18 junior national team at the FIBA Europe Under-18 Championship's 2000 tournament. Greece finished in third place in the tournament, winning the bronze medal. He averaged 10.1 points per game at the tournament. Spanoulis also played at the 2000 edition of the Albert Schweitzer Under-18 World Tournament, where he averaged 14.0 points per game, and won the silver medal with Greece. Spanoulis was also on the Greek under-20 junior national team that finished in first place, and thus won the gold medal, at the 2002 FIBA Europe Under-20 Championship. During the 2002 FIBA Europe Under-20 championship's gold medal game, Spanoulis sank two clutch free throws, with just 13 seconds remaining on the game clock. That allowed Greece to clinch the win over the Spain under-20 national team, and win the tournament's gold medal. Spanoulis averaged 16.0 points per game at the tournament. Greece national team Spanoulis played with Greece's national men's under-26 selection at the 2001 Mediterranean Games.